GB2146634A

GB2146634A - Reinforcement element

Info

Publication number: GB2146634A
Application number: GB08325265A
Authority: GB
Inventors: Hans Christer Georgii
Original assignee: Hydro Betong AB
Current assignee: Hydro Betong AB
Priority date: 1983-09-21
Filing date: 1983-09-21
Publication date: 1985-04-24
Also published as: GB8325265D0; GB2146634B

Abstract

An object to be mixed in concrete consists of a body formed of a thin steel wire (1,2) or the like including a cavity for the concrete which is considerably larger than the volume taken up by the steel wire proper, the steel wire body being shaped so as to fend off similar steel wire bodies. A plastics filler (6) may be incorporated to decrease the final density of the reinforced concrete. <IMAGE>

Description

SPECIFICATION Object to be mixed in concrete to provide a reinforcement of the final concrete product To obtain a certain reinforcement of the final concrete product the concrete is provided during the mixing operation with short metal rods, fibres or like objects. These objects are introduced into the mixer in the hope that they will be distributed fairly evenly in the final concrete product. However, an even distribution of such reinforcement objects is not feasible and for this reason one has had to supply much more objects than would be necessary if it were possible to warrant an even distribution. The object according to the present invention admits even distribution in the final concrete product and this has made it possible considerably to reduce the percentual addition of reinforcement objects, for instance from about 3% to about 1% of the volume of the final concrete product.Characteristic of the object is that it consists of a body formed of a thin steel wire or the like including a cavity for the concrete which is considerably larger than the volume taken up by the steel wire proper, said steel wire body being shaped so as to fend off similar steel wire bodies. Reinforcement objects according to the invention will thus fill up the entire space for the concrete product although they do not prevent the supply of the required concrete. Thus the reinforcement objects will of necessity be evenly distributed in the final concrete product.

The invention will be described in more detail hereinafter with reference to the accompanying drawing which illustrates by way of example some embodiments of the object according to the invention and in which: Figure 1 shows a longitudinal section of an embodiment of the object; Figure 2 is an end view of the same object; Figure 3 shows a longitudinal section of a second embodiment of the object; Figure 4 is an end view of said second embodiment; Figures 5 and 6 are end views of two other embodiments of the object; and Figures 7 - 9 are cross-sectional views of three further embodiments of the object.

In the embodiment shown i Figures 1 and 2 the object consists of two steel wires 1 and 2 which are helically wound in opposite directions. The distance between the winding turns of the steel wire 1 is such that reinforcement bodies consisting solely of the steel wire 1 would not have the fending function that is so important to the invention. The steel wire 2, however, warrants this function because it is wound in the opposite direction relative to the steel wire 1.

In wound condition the steel wire 2 has preferably a slightly larger outer diameter than the inner diameter of the steel wire 1 so that the helically wound steel wires 1 and 2 will be fixed to each other.

In the embodiment of Figures 3 and 4 the helically wound steel wire 3 has a distance 4 between the winding turns which is less than the width of the steel wire 3 for which reason it fends off similar steel wire bodies quite easily. According to the drawing the steel wire 3 is flattened, which has made it possible to give a reasonable pitch to the helically wound steel wire 3.

In the embodiments described above the steel wires 1 - 3 are helically wound along a circular arc.

According to Figures 5 and 6, however, the steel wires in the reinforcement object of the invention may be wound helically in such manner that, seen from the end, they will have the shape of a square or a triangle.

It is not always necessary that the final concrete product should contain concrete only on the sides of the reinforcement. In some cases the final product may contain a filler material of e.g. iight-weight material such as a plastics. This material may be provided inside the steel wire body. Thus, according to Figures 7 - 9 the helically wound steel wire 5 is provided with a body 6 of plastics or like material situated inside said wire. This body 6 is shaped so that there is room for a certain amount of concrete in the steel wire body while it still fends off similar steel wire bodies. The body 6 according to Figure 7 is star-shaped with the points 7 bearing against the steel wire 5. Thus, there is room for the concrete between the points 7 while the ends of the points 7 serve as fending means.The body 6 according to Figure 8 is tubular with the outer periphery bearing against the steel wire 5. Thus there is room for the concrete in the hollow space 8 in the tube while the outer periphery serves as fending means. The body 6 according to Figure 9 is a combination of the bodies 6 of Figures 7 and 8, i.e. it is provided both with points 7 and a hollow space 8.

According to the embodiments shown in the drawing the reinforcement object is cylindrical and has a circular, square or triangular cross-section.

Other shapes are of course possible. Thus the steel wire body may, for example, be spherical, the surface of the sphere being formed of steel wire wound as a loose ball. In one and the same concrete product use is normally to be made of the same type of reinforcement objects even though it is possible to mix various types of reinforcement objects.

The volume of the steel wire in the steel wire body is to constitute as large a part of the volume of the entire steel wire body as the part that the reinforcement is to constitute of the final concrete product.

The entire final concrete product will thereby be filled up with steel wire bodies. Thus, for example, the steel wire, which is helically wound in the steel wire body, may have a diameter of 0.5 mm while the steel wire body proper has a diameter of 1 Omm. The length of the steel wire body may preferably be 30 mm.

1. Object to be mixed in concrete to provide a reinforcement of the final concrete product, characterized in that it consists of a body formed of a thin steel wire or the like including a cavity for the concrete which is considerably larger than the volume taken up the steel wire proper, said steel wire body being shaped so as to fend off similar

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Object to be mixed in concrete to provide a reinforcement of the final concrete product To obtain a certain reinforcement of the final concrete product the concrete is provided during the mixing operation with short metal rods, fibres or like objects. These objects are introduced into the mixer in the hope that they will be distributed fairly evenly in the final concrete product. However, an even distribution of such reinforcement objects is not feasible and for this reason one has had to supply much more objects than would be necessary if it were possible to warrant an even distribution. The object according to the present invention admits even distribution in the final concrete product and this has made it possible considerably to reduce the percentual addition of reinforcement objects, for instance from about 3% to about 1% of the volume of the final concrete product.Characteristic of the object is that it consists of a body formed of a thin steel wire or the like including a cavity for the concrete which is considerably larger than the volume taken up by the steel wire proper, said steel wire body being shaped so as to fend off similar steel wire bodies. Reinforcement objects according to the invention will thus fill up the entire space for the concrete product although they do not prevent the supply of the required concrete. Thus the reinforcement objects will of necessity be evenly distributed in the final concrete product. The invention will be described in more detail hereinafter with reference to the accompanying drawing which illustrates by way of example some embodiments of the object according to the invention and in which: Figure 1 shows a longitudinal section of an embodiment of the object; Figure 2 is an end view of the same object; Figure 3 shows a longitudinal section of a second embodiment of the object; Figure 4 is an end view of said second embodiment; Figures 5 and 6 are end views of two other embodiments of the object; and Figures 7 - 9 are cross-sectional views of three further embodiments of the object. In the embodiment shown i Figures 1 and 2 the object consists of two steel wires 1 and 2 which are helically wound in opposite directions. The distance between the winding turns of the steel wire 1 is such that reinforcement bodies consisting solely of the steel wire 1 would not have the fending function that is so important to the invention. The steel wire 2, however, warrants this function because it is wound in the opposite direction relative to the steel wire 1. In wound condition the steel wire 2 has preferably a slightly larger outer diameter than the inner diameter of the steel wire 1 so that the helically wound steel wires 1 and 2 will be fixed to each other. In the embodiment of Figures 3 and 4 the helically wound steel wire 3 has a distance 4 between the winding turns which is less than the width of the steel wire 3 for which reason it fends off similar steel wire bodies quite easily. According to the drawing the steel wire 3 is flattened, which has made it possible to give a reasonable pitch to the helically wound steel wire 3. In the embodiments described above the steel wires 1 - 3 are helically wound along a circular arc. According to Figures 5 and 6, however, the steel wires in the reinforcement object of the invention may be wound helically in such manner that, seen from the end, they will have the shape of a square or a triangle. It is not always necessary that the final concrete product should contain concrete only on the sides of the reinforcement. In some cases the final product may contain a filler material of e.g. iight-weight material such as a plastics. This material may be provided inside the steel wire body. Thus, according to Figures 7 - 9 the helically wound steel wire 5 is provided with a body 6 of plastics or like material situated inside said wire. This body 6 is shaped so that there is room for a certain amount of concrete in the steel wire body while it still fends off similar steel wire bodies. The body 6 according to Figure 7 is star-shaped with the points 7 bearing against the steel wire 5. Thus, there is room for the concrete between the points 7 while the ends of the points 7 serve as fending means.The body 6 according to Figure 8 is tubular with the outer periphery bearing against the steel wire 5. Thus there is room for the concrete in the hollow space 8 in the tube while the outer periphery serves as fending means. The body 6 according to Figure 9 is a combination of the bodies 6 of Figures 7 and 8, i.e. it is provided both with points 7 and a hollow space 8. According to the embodiments shown in the drawing the reinforcement object is cylindrical and has a circular, square or triangular cross-section. Other shapes are of course possible. Thus the steel wire body may, for example, be spherical, the surface of the sphere being formed of steel wire wound as a loose ball. In one and the same concrete product use is normally to be made of the same type of reinforcement objects even though it is possible to mix various types of reinforcement objects. The volume of the steel wire in the steel wire body is to constitute as large a part of the volume of the entire steel wire body as the part that the reinforcement is to constitute of the final concrete product. The entire final concrete product will thereby be filled up with steel wire bodies. Thus, for example, the steel wire, which is helically wound in the steel wire body, may have a diameter of 0.5 mm while the steel wire body proper has a diameter of 1 Omm. The length of the steel wire body may preferably be 30 mm. CLAIMS

1. Object to be mixed in concrete to provide a reinforcement of the final concrete product, characterized in that it consists of a body formed of a thin steel wire or the like including a cavity for the concrete which is considerably larger than the volume taken up the steel wire proper, said steel wire body being shaped so as to fend off similar steel wire bodies.

2. Object as claimed in claim 1, characterized in that the volume of the steel wire in the steel wire body constitutes as large a part of the volume of the entire steel wire body as the part that the reinforcement is to constitute of the final concrete product, whereby the entire final concrete productwill be filled up with steel wire bodies.

3. Object as claimed in claim 1 or 2, characterized in that the steel wire body consists of at least one helically wound steel wire.

4. Object as claimed in claim 3, characterized in that the helically wound steel wire has a distance between the windning turns which is less than the width of the steel wire.

5. Object as claimed in claim 4, characterized in that the steel wire has a flattened cross-section.

6. Object as claimed in claim 3, characterized in that the helically wound steel wire is provided with another steel wire arranged inside it and helically wound in the opposite direction.

7. Object as claimed in claim 3, characterized in that the helically wound steel wire is provided with a body of plastic or the like which is arranged inside said wire and shaped so that there is room for a certain amount of concrete in the steel wire body while this still fends off similar steel wire bodies.

8. Object as claimed in claim 7, characterized in that the plastic body arranged inside the steel wire body is tubular.

9. Object as claimed in claim 7 or 8, characterized in that the plastics body arranged inside the steel wire body has an outer contour of star-shaped cross-section.

10. Object as claimed in claim 1 or 2, characterized in that the steel wire body is spherical, the surface of the sphere being formed of steel wire wound as a loose ball.

11. Object to be mixed in concrete to provide a reinforcement of the final concrete product, substantially as hereinbefore described with reference to and as illustrated by the accompanying drawing.